There are three types of Models that can be defined at the time of creating models for your IoT applications. The three models are:
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For example: Here is the definition of a ThingModel - PhidgetSensorModel that combines PhidgetSensorFacet.
Definition
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<ThingFacet Name="PhidgetSensorFacet"> <Integer Name="SensorValue" Update="auto" KnownBy="PhidgetSensorAction"/> <String Name="SensorURL" Default="phid://"/> <String Name="SensorInterfaceIndex"/> <String Name="SensorType"/> <String Name="SensorInterfaceType"/> <String Name="SensorValueFormat"/> <String Name="Simulated"/> </ThingFacet> <ThingModel Name="PhidgetSensorModel" Combines="PhidgetSensorFacet"> <Sid Name="phidId"/> </ThingModel> |
Deploy and Create:
The instances of PhidgetSensorModel is created using Create TQL Query.
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The Result of Model Instance Creation is:
Note that there is Status returned for every attribute that gets created.
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<Create Status="Success"> <PhidgetSensors> <phidId>KNUBPHLOAAAAUAABA6EJCI75</phidId> <SensorValue Status="Success+Created:1:1457740291438;" Value="" Version="1"/> <SensorURL Status="Success+Created:1:1457740291442;" Value="phid://" Version="1"/> <SensorInterfaceIndex Status="Success+Created:1:1457740291443;" Value="0" Version="1"/> <SensorType Status="Success+Created: |
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Automatically generated System Attributes
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1:1457740291444;" Value="Rotation" Version="1"/>
<SensorInterfaceType Status="Success+Created:1:1457740291444;" Value="PhidgetInterfaceKit" Version="1"/>
<SensorValueFormat Status="Success+Created:1:1457740291445;" Value="Raw" Version="1"/>
<Simulated Status="Success+Created:1:1457740291445;" Value="true" Version="1"/>
</PhidgetSensors>
</Create> |
Find Model Instances
After Model Instances are created, you can Read them using Find Query with constraints.
| Code Block | ||||||
|---|---|---|---|---|---|---|
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<Query>
<Find format="all">
<PhidgetSensors>
<SensorURL ne =""/>
</PhidgetSensors>
</Find>
</Query> |
Find Query Result
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<Find Status="Success" Format="all">
<Result>
<PhidgetSensors QName="SimpleModel.MyModels.PhidgetSensors">
<phidId>KNUBPHLOAAAAUAABA6EJCI75</phidId>
<SensorValue Value="" Known="60" Version="1" Timestamp="1457740291438" DateTime="2016-03-11 15:51:31.438" QName="SimpleModel.MyModels.PhidgetSensors.SensorValue" FName="SensorValue"/>
<SensorURL Value="phid://" Known="phid://" Version="1" Timestamp="1457740291442" DateTime="2016-03-11 15:51:31.442" QName="SimpleModel.MyModels.PhidgetSensors.SensorURL" FName="SensorURL"/>
<SensorInterfaceType Value="PhidgetInterfaceKit" Known="PhidgetInterfaceKit" Version="1" Timestamp="1457740291444" DateTime="2016-03-11 15:51:31.444" QName="SimpleModel.MyModels.PhidgetSensors.SensorInterfaceType" FName="SensorInterfaceType"/>
<Simulated Value="true" Known="true" Version="1" Timestamp="1457740291445" DateTime="2016-03-11 15:51:31.445" QName="SimpleModel.MyModels.PhidgetSensors.Simulated" FName="Simulated"/>
<SensorInterfaceIndex Value="0" Known="0" Version="1" Timestamp="1457740291443" DateTime="2016-03-11 15:51:31.443" QName="SimpleModel.MyModels.PhidgetSensors.SensorInterfaceIndex" FName="SensorInterfaceIndex"/>
<SensorType Value="Rotation" Known="Rotation" Version="1" Timestamp="1457740291444" DateTime="2016-03-11 15:51:31.444" QName="SimpleModel.MyModels.PhidgetSensors.SensorType" FName="SensorType"/>
<SensorValueFormat Value="Raw" Known="Raw" Version="1" Timestamp="1457740291445" DateTime="2016-03-11 15:51:31.445" QName="SimpleModel.MyModels.PhidgetSensors.SensorValueFormat" FName="SensorValueFormat"/>
</PhidgetSensors>
</Result>
</Find> |
Automatically generated System Attributes
System Attribute Name | Description | Persisted | Query Constraint? |
|---|---|---|---|
| Version | Version number of the attribute. This number is automatically incremented each time the value changes. No historical data is persisted. Only the last value is persisted. | Yes | No. You can request the value using Format on <Find> |
| Value | The value of the attribute is stored in "Value". This is specified by user at time of create/save query | Yes | Yes |
| Timestamp | Unix epoch time at the time (in millisecond) of the attribute creation. For example: Timestamp value1457663102004 is same as Fri, 11 Mar 2016 02:25:02 GMT Note that this is only the "Create" timestamp. If attributes are updated their timestamp do not change. | Yes | No |
| QName | Fully qualified name of the attribute. <NamSpace>.<Domain>.<ModelName>.<AttributeName>. For example SimpleModel.MyModels.VendorInfo.vendorName given that VendorInfo is defined withinNamespace - SimpleModel, with Domain as MyModels and DataModel Name as VendorInfo | Yes | No |
| Known | Applicable to ThingFacet/AppFacet. Known is the value that is set within the Action. Known can not be set using Create / Update TQL Query by the user. | Yes | No |
| FName | Given name of the attribute name. | Yes | No |
| Datetime | Formatted data time value of the attribute creation. For example:2016-03-10 18:25:02.004 Note that is is only the "Create" Datetime. If attributes areupdated their datetime value do not change. | Yes | No |
| Status | This is transient attribute returned as part of the result of TQL Create/Save, Update and Delete operations | No | No. |